From fcb2a96dda8909cd01bea92fb03d67ecc65ea89f Mon Sep 17 00:00:00 2001
From: ege-arhan <ege.arhan@icloud.com>
Date: Fri, 23 Oct 2026 03:38:13 +0000
Subject: [PATCH] fix(passthrough): type stash/request dicts to stay inside
 basedpyright ceiling

---
 .../openai_like/messages/transformation.py    | 29 +++++++++++--------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/litellm/llms/openai_like/messages/transformation.py b/litellm/llms/openai_like/messages/transformation.py
index 316e48a0947..351d7837627 100644
--- a/litellm/llms/openai_like/messages/transformation.py
+++ b/litellm/llms/openai_like/messages/transformation.py
@@ -1,4 +1,4 @@
-from typing import Any, Final
+from typing import Any, Final, cast
 
 import litellm
 from litellm.litellm_core_utils.url_utils import join_api_base
@@ -95,17 +95,22 @@ class OpenAILikeAnthropicMessagesConfig(AnthropicMessagesConfig):
         model the cost map does not know (see #40890). Pop them before the
         base transform so no drop warning fires, restore afterwards.
         """
-        stashed: Final = {
-            _key: anthropic_messages_optional_request_params.pop(_key)
-            for _key in ("thinking", "output_config", "temperature")
-            if _key in anthropic_messages_optional_request_params
-        }
-        request: Final = super().transform_anthropic_messages_request(
-            model=model,
-            messages=messages,
-            anthropic_messages_optional_request_params=anthropic_messages_optional_request_params,
-            litellm_params=litellm_params,
-            headers=headers,
+        params: Final[dict[str, object]] = cast(
+            dict[str, object], anthropic_messages_optional_request_params
+        )
+        stashed: Final[dict[str, object]] = {}
+        for _key in ("thinking", "output_config", "temperature"):
+            if _key in params:
+                stashed[_key] = params.pop(_key)
+        request: Final[dict[str, object]] = cast(
+            dict[str, object],
+            super().transform_anthropic_messages_request(  # pyright: ignore[reportUnknownMemberType]  # base returns unparameterized dict
+                model=model,
+                messages=messages,
+                anthropic_messages_optional_request_params=params,
+                litellm_params=litellm_params,
+                headers=headers,
+            ),
         )
         if self.supports_cache_control_ttl():
             request.update(stashed)